<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
    <div id="app"></div>
    <template id="my-app">
     <h2>{{getFullName}}</h2>
     <h2>{{fullName}}</h2>
    </template>
    <script src="../lib/js/vue.js"></script>
  <script>
    const app=Vue.createApp({
      template:'#my-app',
      data(){
        return{
          first_name:'san',
          last_name:'zhang' 
        }
      },
       methods:{
          getFullName(){
            return this.last_name+'-'+this.first_name
          }
       },
       computed:{
            fullName(){
              return this.last_name+'-'+this.first_name
            }
       }
    })
    app.mount("#app")
  </script>
</body>
</html>